SAN JUAN, Puerto Rico — The Coast Guard continues investigating Monday a diesel fuel spill of at least 600 gallons in the San Antonio Channel of San Juan Harbor, Puerto Rico.

The diesel spill reportedly occurred early Sunday during the fueling of the 176-foot Panamanian ro-ro container ship Midnight Chief at Pier 10. An oil field vacuum truck collected the recoverable fuel that had been spilled into the water from the containment area surrounding the vessel and enclosing the Pier 10 entrance.

Coast Guard pollution investigators confirmed, following aerial and surface assessments aboard a Coast Guard helicopter, Monday morning that most of the diesel in the San Antonio Channel had dissipated and the remaining discharged fuel was unrecoverable and would continue to naturally dissipate.

The diesel spill was initially reported to the National Response Center, who in turn reported the incident to Coast Guard Watchstanders in Sector San Juan as well as other commonwealth agencies Sunday morning.